Yumeia, Dungeon Adept

Eminence— Raid Party. (A Party consists of an Artificer, Berserker, Druid, and Warlock in addition
to previous creature types.) Whenever you cast a
party creature, venture into the dungeon.
Yumeia has all activated abilities of party
creatures you own in exile.
{10}: Search your library for a creature and exile it.
You may cast creatures exiled this way. This
ability costs {1} less for each creature in your party.